You should use the --bot option if your bot was present when the channel was logged as it will strip the "botname: " part from messages where users addressed the bot.

If your bot (or any other bot in the channel) can take commands that all start in a similar way, use the --ignore-regex option to ignore those lines, e.g. --ignore-regex='^!\w+' for bots that react to commands prefixed with '!'.

The --case option controls the second parameter passed to lc_irc from IRC::Utils. The default is 'rfc1459'. You usually don't have to change this. Consult that package's documentation for more information.